Odoo has an inbuilt HTTP-Server, so if your Windows 7 machine is accessible from the internet, you can access Odoo with your IP address on port 8069 (http://xxx.xxx.xxx.xxx:8069). If you want to use your own domain, first make a DNS entry pointing to your server IP. If you want to have a professional and proper setup, you should use a web server and reverse proxying, so you should get familiar with these terms first.